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There are a number of reasons why tracking a particular tracking number may not be working. These vary by type of tracking number:

iShip Tracking Numbers


iShip tracking numbers begin with the letters "MM", "MA", or "EM" and are 13 characters long. If you receive an error message that looks like the following:
**********************************
We were unable to track your package.
MASERZRK3HROE
Please make sure the tracking number is correct, select a carrier from the list below, and click on Submit.
**********************************
please check the following:

  1. The tracking number should not contain the letters "I", "L", or "O". If it does, switch the I and/or L to a one, and/or the O to a zero, and try your tracking request again.
  2. The tracking number should contain 13 characters.
  3. The package record may have been edited. When a package is edited before shipment, the original tracking number is voided, and a new one is created. If you received the tracking number via e-mail, you should receive a second e-mail with the new tracking number.
Finally, if you track a package using an "EM" tracking number and obtain unexpected results, such as a different delivery date than you requested, switch the "E" to an "M" and try your request again.

Carrier tracking numbers


If you are trying to track a package using a carrier tracking number directly, there are some common mistakes that can cause problems. Use these hints below to see if your tracking number is correct:

  1. UPS tracking numbers usually begin with "1Z", contain 18 characters, and do not contain the letters "O", "I", or "Q".
  2. UPS tracking numbers that do not begin with "1Z" include tracking numbers for Air Shipping Documents (hand-written airbills) and International Air Waybills.
  3. FedEx Express tracking numbers are normally 12 digits long and do not contain letters.
  4. FedEx Ground tracking numbers are normally 15 digits long and do not contain letters.
  5. DHL tracking numbers are normally 10 or 11 digits long and do not contain letters.
  6. USPS Delivery Confirmation numbers are normally 20-22 digits long and do not contain letters.
  7. USPS Express Mail tracking numbers are normally 13 characters long, begin with two letters, and end with "US".

UPS Store (MBE) PSO numbers


Some UPS Store or Mail Boxes, Etc. locations give out Parcel Shipping Order (PSO) numbers instead of tracking numbers. PSO numbers are normally 8 digits long and cannot be used to track packages through iShip. You may, however, be able to "track by reference" with a PSO number on the UPS web site, if you shipped your package with UPS. See the Knowledgebase Article on UPS Store PSO Numbers.

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